Is this on a fresh OS install for the new system?
Have you set DOCP for the RAM? HAve you tried running RAM at BIOS defaults..2133MHz and seeing if the same thing occurs?
Latest chipset driver?
Yes I've tried with a fresh install as well.
I'll play with the RAM settings a bit. I've only used the default BIOS settings.
Latest chipset driver doesn't quite apply to Linux. The majority of the drivers are bundled in the kernel. Since I tried with the latest kernel I suppose I tested with the latest and greatest drivers that my OS has.
One thing to note is that linking executables on my HDD is very fast. On my SSD though it's slow. That's a bit weird.
Hmm..well, even though BIOS defaults should be a stable starting point...sometimes these large RAM modules have difficulty on this platform and maybe increasing VDIMM to 1.35 will help?
I have next to zero experience with Linux so I'm afraid I'm no help there....
I'm having a very similar setup (Aorus + Threadripper) and very similar issues.
On Ubuntu 17.10 the PCIe bus errors went away by adding pcie_aspm=off to grub, but after upgrading to 18.04 the errors started again (even on the old kernel).
One (temporary) solution I found is switching to PCIe 2.0 in BIOS, but this comes at a (slight) cost in graphics performance.
It would be great is AMD could look at this and help us solve the issues!